3M 2237 Red Dot ™ Foam Monitoring Electrodes Case of 20 bags (50 electrodes per bag, total 1000 electrodes per case). With 3M™ SureSeal moisture barrier cap to help ensure freshness. (3M) Easy to handle for quick application, these tear-drop-style electrodes feature a foam backing that is occlusive to fluids as well as comfortable for patients. The electrodes' solid gel penetrates skin quickly, allowing for high-quality, uninterrupted traces, and has a low chloride content to help minimize skin irritation.